diff --git a/gym/envs/mujoco/mujoco_env.py b/gym/envs/mujoco/mujoco_env.py
index 073f8273b..7461abaf2 100644
--- a/gym/envs/mujoco/mujoco_env.py
+++ b/gym/envs/mujoco/mujoco_env.py
@@ -8,19 +8,10 @@ import six
 
 try:
     import mujoco_py
+    from mujoco_py.mjlib import mjlib
 except ImportError as e:
     raise error.DependencyNotInstalled("{}. (HINT: you need to install mujoco_py, and also perform the setup instructions here: https://github.com/openai/mujoco-py/.)".format(e))
 
-
-# move this into mujoco-py next time we upgrade it!!!
-# ---------------------------------------------------
-from mujoco_py.mjlib import mjlib
-from mujoco_py.mjtypes import POINTER, MJMODEL, MJDATA
-mjlib.mj_resetData.argtypes = [POINTER(MJMODEL), POINTER(MJDATA)]
-mjlib.mj_resetData.restype = None
-# ---------------------------------------------------
-
-
 class MujocoEnv(gym.Env):
 
     """
diff --git a/setup.py b/setup.py
index 90efa5a8e..bc9620192 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@ setup(name='gym',
           'all': ['atari_py>=0.0.17', 'Pillow', 'pyglet', 'PyOpenGL',
                   'pachi-py>=0.0.19',
                   'box2d-py',
-                  'mujoco_py>=0.4.2', 'imageio'],
+                  'mujoco_py>=0.4.3', 'imageio'],
 
           # Environment-specific dependencies. Keep these in sync with
           # 'all'!
@@ -30,7 +30,7 @@ setup(name='gym',
           'board_game' : ['pachi-py>=0.0.19'],
           'box2d': ['box2d-py'],
           'classic_control': ['pyglet', 'PyOpenGL'],
-          'mujoco': ['mujoco_py>=0.4.2', 'imageio'],
+          'mujoco': ['mujoco_py>=0.4.3', 'imageio'],
       },
       package_data={'gym': ['envs/mujoco/assets/*.xml', 'envs/classic_control/assets/*.png']},
       tests_require=['nose2', 'mock'],